Our driveway is gravel but the person door is always in shade so I stick a box fan in the door and crack the overhead doors open. Makes a difference but I can feel the heat off the roof.Just make sure your incoming air is actually cooler. Does not help the situation if it's coming off the hot asphalt in front of the doors....
Sometimes it's just easier to suck in cooler air from under some shade trees than it is to blow out hot air.